Topic
Indentation
About: Indentation is a research topic. Over the lifetime, 13002 publications have been published within this topic receiving 340476 citations.
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TL;DR: In this article, the authors investigated the mechanical properties of sintered nano-composite with 1 − 4vol% reinforcement by ultra-nano-indenter (UNHT) technique and revealed that the presence of reinforcements controlled the grain morphology of the microstructure.
78 citations
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TL;DR: In this article, a micromechanical model describing quasi-ductile Hertzian contacts in otherwise brittle ceramics is developed, where a discrete "fault" along an internal weak interface, constrained at its ends by an elastic matrix and subject to frictional sliding, in the subsurface zone of high shear stress in the Hertzians field is described.
78 citations
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TL;DR: The ratio between indentation hardness and modulus is shown to be approximately constant in biological materials, and it is suggested that quasi-plastic deformation is a frequent yet poorly understood damage mode, highlighting an important area of future research.
78 citations
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TL;DR: In this article, the elastic contact theories of Hertz and Love reproduced the elastic portion of the load-displacement curves of a single crystal Fe (3 wt.% Si) with a thin passivation film.
Abstract: Continuous microindentation tests performed on the electropolished surfaces of single crystal Fe (3 wt.% Si), known to have a thin passivation film, show a sharp discontinuity at a load of 1.8 mN. To this point, there was no apparent plastic deformation in the metal in that the loading and unloading curves exactly overlay each other. Stresses at the discontinuity were close to the theoretical strength of the metal. Elastic contact theories of Hertz and Love reproduced the elastic portion of the load-displacement curves. On removing the passivation film with a HCl solution, indentation tests yielded strengths nearly two orders of magnitude smaller. The strength recovered to near its initial value after the liquid evaporated and the passivation film re-formed.
78 citations
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TL;DR: In this paper, a model for extracting the intrinsic elastic modulus of thin films from the composite film/substrate modulus value obtained from indentation tests on coated systems is presented.
Abstract: Several models have been developed to extract the intrinsic elastic modulus of thin films from the composite film/substrate modulus value obtained from indentation tests on coated systems. Either analytical, semi-analytical or empirical, they generally propose an expression for the composite modulus as a function of the film and substrate elastic moduli and of the film thickness. When the substrate properties and the film thickness are known, the expression without adjustable parameter contains only the film elastic modulus as an unknown parameter, which can thus be deduced. In this paper, some models from the literature are briefly described and compared with the easy-to-use model we have developed. Based on experimental results obtained with various film/substrate systems, this paper also aims to demonstrate that the error induced by the uncertainty in the knowledge of the substrate Young's modulus value and in the film thickness value is often as large as the difference resulting from the choice of the...
78 citations